If you ever need to update your expired gpg keys, it's not terrible. First thing to do is to figure out which key you're working with, use
$> gpg --list-keys
Which should show you something like this
-----------------------------
pub rsa3072 2020-12-29 [SC] [expired: 2024-12-31]
09CF4ABCD7487EF21E9AFC859B4CE836EAAF3E31
uid [ expired] Russell Simpkins <russellsimpkins@gmail.com>
Then you can edit the key using the ID
$> gpg --edit-key 09CF4ABCD7487EF21E9AFC859B4CE836EAAF3E31
gpg (GnuPG) 2.2.19; Copyright (C) 2019 Free Software Foundation, Inc.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Secret key is available.
sec rsa3072/9B4CE836EAAF3E31
created: 2020-12-29 expires: 2026-01-02 usage: SC
trust: ultimate validity: ultimate
ssb rsa3072/CC533814855BD92B
created: 2020-12-29 expired: 2024-12-31 usage: E
[ultimate] (1). Russell Simpkins <russellsimpkins@gmail.com>
To change or update the expiration time, type the following
$> expire
It will prompt you to choose, I like to update mine yearly but you can pick whatever option you want. If you have a sub key like I do, then you will want to update that as well. Just pick the key using the following command
$> key 1
gpg> key 1
sec rsa3072/9B4CE836EAAF3E31
created: 2020-12-29 expires: 2026-01-02 usage: SC
trust: ultimate validity: ultimate
ssb* rsa3072/CC533814855BD92B
created: 2020-12-29 expired: 2024-12-31 usage: E
[ultimate] (1). Russell Simpkins <russellsimpkins@gmail.com>
Notice that ssb has an asterisks next to it, that's how you know you're editing the sub key. Follow the same and type "expire" to set it's expiration date. That's it. Type "quit" to exit.
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